The table relates the response to a fund-raising appeal by a college to its alumni to the number of years since graduation. Response Years Since Graduation           0-5 6-20 21-35 Over 35    Positive 120 440 210 90   None 1380 3560 3290 910   An alumnus is selected at random. Adjoin the row and column totals to the table and use the expanded table to find the probability of each of the following events.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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The table relates the response to a fund-raising appeal by a college to its alumni to the number of years since graduation.

Response Years Since Graduation        
  0-5 6-20

21-35

Over 35 

 
Positive 120 440 210 90  
None 1380 3560 3290 910  

An alumnus is selected at random. Adjoin the row and column totals to the table and use the expanded table to find the probability of each of the following events. Round all answers to three decimal places.

    1. The alumnus responded. 

    2. The alumnus did not respond. 

    3. The alumnus graduated at least 21 years ago. 

    4. The alumnus graduated at least 21 years ago and responded.

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